Fluid hoist construction



.im 19, maj

W. L. KOMPH, SR

FLUID .HOIST CONSTRUCTION Filed Deo. 8, 1941 v A TToRNE Ys.

UNITED lSTATES PATEN'i` EEICE FLUID HOIST CONSTRUCTION William L. Komph,Sr., Detroit, Mich., assignor to Gar Wood Industries, Inc., Detroit,Mich., a corporation of Michigan Application December 8, 1941, SerialNo. 422,135

Claims.

The present invention relates to improvements in hydraulic hoistconstructions, and particularly to improvements in telescopic hoistconstructions.

One of the primary objects of the present inouter cylindrical member I2has a base plate I5 welded thereto which is provided with a pivotbearing I5 for pivotal attachment to` a mounting element, such as thechassis of a dump truck.

vention is to provide improvements in hoists of 5 The opposite end, orhead end, of the cylinder the type mentioned in which the elements form-I2 has an aligned annular extension I8 fixed to ing the hoist are of arelatively simple form and the end edge thereof in which the innersurfaces may be manufactured by simplified methods. of the cylinder I2and the member I8 are ush Another object of the invention is to providewith each other. An annular bearing member an improved structure of thetype mentioned in 20, having an inwardly projecting portion prothemanufacture of which relatively complicated viding a bearing surface 22,is fixed to the edge and expensive operations may be eliminated, of themember I8 by means of a plurality of thereby effecting considerablemanufacturing screws 24, which may be suitably spaced thereeconomy.around. The member 2B is provided with an Other more specific objects ofthe invention are annular groove 26 on the inner surface thereof toprovide an improved telescopic hoist construcand adjacent the outer edgethereof, within which tion in which split bronze followers and splitstop a packing or sealing element 2B, of suitable marings are used andmerely set into grooves formed terial, is disposed. Such sealing element28 proin the hoist cylinders to form a packing box; in jects slightlyinwardly of the bearing surface 22, which the inside diameters of thecylinders are and is adapted to bear against the outer surreamed androlled, which eliminates micro-grindface of the next adjacentcylindrical member I4. ing; in which the outside diameters are turnedThe inner cylindrical members I4 are of proand polished, whicheliminates the Norton grindgressively decreasing diameter, and aredisposed ing operation; in which the same size threads in telescopic ornesting relationship with respect are used in each end of each cylinder,thereby to each other. Each of such members I4, with making it possibleto use the same thread die; in which the sealing is on the inside borerather than on the outside surface of the adjacent cylindrical member,so that the pressure acts on the total area of the bore; and inwhich'welding is reduced to a minimum.

Other objects of the invention will become apparent from the followingspecification, the drawing relating thereto, and from the claimshereinafter set forth.

In the drawing, in which like numerals are used to designate like partsin the several views throughout:

Figure 1 is a side elevational View with parts broken away showing partsin cross section of an improved telescopic hoist construction embodyingfeatures of the present invention;

Fig. 2 is an enlarged cross-sectional view of that portion of thestructure within the circle 2 of Figure 1;

Fig. 3 is a view similar to Figure 2 of that portion of the structurewithin the circle 3 of Figure 1;

Figs, 4 and 5 are elevational views of the follower and stop ring,respectively, shown in Figure 2; and

Fig. 6 is a cross-sectional view of portions of the cylinders andshowing two of such cylinders in extended position.

Referring to the drawing, a telescopic, hydraulic hoist is generallyindicated at lit, which comprises an outer cylindrical member I2 havinga plurality of telescopically received cylindrical elements I4 mountedtherein for longitudinal movement with respect to each other. The

the exception of the innermost one, is provided with integrally threadedends 3B and 32. A base plate 34 is threaded into the base end of each ofthe members I4, and is provided with a central opening 3G therethrough.The innermost member I4 is also provided with a threaded portion 30 andwith the base plate 34 therein. The head end of the innermost member I4is provided with an end cap 35, which is welded to the open head endthereof and which has formed integral therewith a pivot bearing 38 forpivotal attachment to an element such as a dump body.

It will be seen that each of the elements I4 is disposed in radiallyspaced relationship with respect to each other, and the outermostelement Il is disposed in similar radially spaced relationship with theouter cylinder I2. Each of the members I4 is formed with an annulargroove 40, which is adjacent to .but spaced slightly inwardly of thebase end of each member I4. An-

other annular groove 42 is formed in the outer peripheral surface ofeach of the members I4, and is spaced slightly from the inner edge ofthe groove 40.

A split follower or bearing ring 44, of suitable metal such as bronze,is disposed within the groove 4i) and is adapted to abut against thebase edge thereof. An annular packing member 46, of suitable packingmaterial and preferably formed of a plurality of nesting V-shapedelements, is disposed within the groove 49 with one edge thereofabutting against the opposite edge of the groove 4t and with its otheredge engaged by and abutting against the adjacent edge of the follower44.

A split stop ring 48, which is generally L- shaped in cross section, isdisposed Within the groove 42 With the leg portion thereof engaging thatperipheral portion of the member I4 between the grooves 40 and 42' andWith the edge thereof abutting Vagainst the adjacent edge of V Suchmember 4b mayA the packing member 46. be formed of suitable metal, suchas bronze.

It Will thus be seen that the, membersjjll -and 42 project radiallybeyond Vthe peripheral jint'q'the baseendof the'member I2, 4 so thatsuch iluidunder pressurejentendsthe elements I4 with respecttoeachqother and Withrespect to the Outer-member l2. .As Such, members,I4 are extended, .it will .be ,appreciated .that the members 44,4Eiandj48bear againstthe inner surfaces of the adjacent members I4 andIZ, and when in theirfully extended positions thehstop rings 43abut-`against the stop nuts 50 or` 20 to limit the relative movement 'ofthe members I 4 with respect to each other and With respect to themember I2.`

Each of the members EQis providedwith an annular 'groove and annularpacking elements similar to the groove 25 and packing element 28,Whichds adaptedto abutjagainst the outer surface of the adjacent memberI4.

From the above description, it 'll beevident that the 4present inventionprovides a simplified 'sftructur`e which accomplishes the objectspointed iithereinabova jfl, Inj'an hydraulic hoist construction, a plu-`rality of telescopic'ally 'disposed cylindrical memberslsaidlmembersbjeing disposed Ain radially spaced relation with respect toeachother, means vidirig. a rgroove in the outer surface of an innernefof Vsaid cylindrical members, and sealfing meansfdisposedfwithin said'groove adapted t'o bear Y against the inner surface of the yadjacentVcylindric'al member, Vvsaid isealing means including an Vannularpacking member Within rvsaid groove, and a metal ring member disposedWithin said-groove and engaging'oleedge'of said packing member, 'andannular means "engaging the oppo- "site ledge of said packing member.`

dially beyond the peripheral surface of said one of said cylindricalmembers andengaging one edge cf said packing member, and annular means`engaging the opposite edge ofv said packing spaced relation withrespect to each other, means 2. Irl-an hydraulic h0ist amstradnon.` apiual'ityof teiescopiaiiy disposed eyundrical members, vsaid membersbeing 4disposed in radially spaced relation With respect to each other,means providing 'a groove in the outer surface of an inner one of lsaidcylindrical members, and seal- 'irig disposed withinsaid groove adaptedto bearfag'ainstthe inner surface of the adjacent cylindrical memberjanannular packing member Vvvitl'iinfsaid Agroove and Vprojecting radiallybeyond the peripheral surface of said one of said cylindrical members, ametal split ring member disposed within saidv groove and projectingraproviding a groove in the outery surface of an inner one of saidcylindrical members adjacent to and spaced inwardly' of the basethereof, and sealing means disposed within said groove adapted to bearagainst the inner surface of the adjacent cylindrical member, Vanyannular packing member within Said ,arenile and. proectins rar diallybeyond the peripheral hsurfa'ce cfu/ said one of said cylindricaimembers, ametal split ring 'member disposedvrihiaseid ,ergere Einarmigering radially beyondtlie peripheraljsurface Vof said one of saidcylindrical members fand len:- saeins one, edge "O Said pagars member,,and annular means engaging the opposite edge of Said packinsmember @Inan hydraulic hsienstructoa e. P111- ralitrof,telesoeially.dsposedylindrl mmbers, said `memlzvers being disposed in4radially spaced relation with respect to each other, means,V

providing agroove in the outer surface of an inner one of saidcylindrical members adjacent to and spaced inwardlyfof the base thereof,and sealing means disposed said groove adapted to bear against the innersurface of the adjacent cylindrical member,rv an annular packing memberWithin said groove and projecting radially beyond the peripheral surfaceofsaid one Vof said cylindrical members, Va metal split ring memberdisposed Within saidgrooveand Vprojecting radially beyond theperipheralfsnrfaceof iris member and rbietine ,radialy berend the bers,said members being disposed in jra'dially spaced relation with respectto eachother, means inner one of saidcylindrical `members adjacent toand spaced inwardly :ofthe base tliereof, seal ing means disposed Withinsaid groove"ael'galiited to bear aganstthe 'innerserfaeOfgtheasiia'cjent cylindrical member, an'annular,gaelinemembr WithinSaid snoei/e ,and PlOJ'Qiiegedielli/,Vb'eYQnd the peripheral'surface Loffone of said cylindrical membersjajmetal split jrinfg member ldisposedWithin -said ugroove and projectingjradially beyond the peripheralsurfaceofnsaid one ofsaid Cylindrical members 'and easaeeyone 'edge 0f"said packing member, 'and annular'means erig'ag-

